Structures Congress 2018
In-Plane Flexibility of Reinforced Concrete Floor Diaphragms with Openings
Publication: Structures Congress 2018: Buildings and Disaster Management
ABSTRACT
There is a lack of discussion in the most recent building codes such as ACSE 7-10 and ACI 318-14 and the most recent committee documents such as ACI 369.1 and ASCE/SEI 41 regarding the effect of the floor openings on in-plane behavior of low-rise reinforced concrete (RC) buildings with long and narrow plans. Results of this paper emphasizes the importance of the stated problem by indicating that the flexible in-plane behavior in such low-rise buildings where the lateral resistance is provided by the end shear walls is likely. Building macro-models using ETABS, capable of simulating the flexible (semi-rigid) behavior of concrete floor diaphragms using shell elements, were created for such buildings to evaluate the effect of the openings on the response of the building to seismic loads. Results show that this behavior (floor flexibility) is more pronounced even when small openings are present at the center panels of the floor diaphragm, where floor flexibility places excessive demands (deflection and stress) on floor panels with opening. Additionally, based on the nonlinear finite element analysis of floor panels with openings (micro-model), it is shown that openings can significantly reduce in-plane load-carrying capacity of slab panels, thus, new recommendations are presented to improve the in-plane capacity of RC slabs with openings.
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Published In
Structures Congress 2018: Buildings and Disaster Management
Pages: 243 - 250
Editor: James Gregory Soules, 1CB&I
ISBN (Online): 978-0-7844-8132-5
Copyright
© 2018 American Society of Civil Engineers.
History
Published online: Apr 17, 2018
Published in print: Apr 17, 2018
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